The Chilean is confident the attacker will justify his expense after the 20-year-old 's transfer from Liverpool was finally completed.
Manchester City manager Manuel Pellegrini is not worried by the 49 million pound ($76 million) fee that his side paid Liverpool to make Raheem Sterling the most expensive ever English player.
The 20-year-old completed his transfer on Tuesday after a protracted and acrimonious pursuit but, though the size of the deal alarmed some, the City boss says that it is worth it to sign the right man.
"The price is not the most important thing.